<?php

namespace Component;

class Helper
{
    /**
     * 判断当前服务器系统
     * @return string
     */
    public static function getOS()
    {
        if (PATH_SEPARATOR == ':') {
            return 'Linux';
        } else {
            return 'Windows';
        }
    }

    /**
     * 当前微妙数
     * @return number
     */
    public static function microtime_float() {
        list ( $usec, $sec ) = explode ( " ", microtime () );
        return (( float ) $usec + ( float ) $sec);
    }

    /**
     * 切割utf-8格式的字符串(一个汉字或者字符占一个字节)
     *
     * @author zhao jinhan
     * @version v1.0.0
     *
     */
    public static function truncate_utf8_string($string, $length, $etc = '...') {
        $result = '';
        $string = html_entity_decode ( trim ( strip_tags ( $string ) ), ENT_QUOTES, 'UTF-8' );
        $strlen = strlen ( $string );
        for($i = 0; (($i < $strlen) && ($length > 0)); $i ++) {
            if ($number = strpos ( str_pad ( decbin ( ord ( substr ( $string, $i, 1 ) ) ), 8, '0', STR_PAD_LEFT ), '0' )) {
                if ($length < 1.0) {
                    break;
                }
                $result .= substr ( $string, $i, $number );
                $length -= 1.0;
                $i += $number - 1;
            } else {
                $result .= substr ( $string, $i, 1 );
                $length -= 0.5;
            }
        }
        $result = htmlspecialchars ( $result, ENT_QUOTES, 'UTF-8' );
        if ($i < $strlen) {
            $result .= $etc;
        }
        return $result;
    }

    /**
     * 遍历文件夹
     * @param string $dir
     * @param boolean $all  true表示递归遍历
     * @return array
     */
    public static function scanfDir($dir='', $all = false, &$ret = array()){
        if ( false !== ($handle = opendir ( $dir ))) {
            while ( false !== ($file = readdir ( $handle )) ) {
                if (!in_array($file, array('.', '..', '.git', '.gitignore', '.svn', '.htaccess', '.buildpath','.project'))) {
                    $cur_path = $dir . '/' . $file;
                    if (is_dir ( $cur_path )) {
                        $ret['dirs'][] =$cur_path;
                        $all && self::scanfDir( $cur_path, $all, $ret);
                    } else {
                        $ret ['files'] [] = $cur_path;
                    }
                }
            }
            closedir ( $handle );
        }
        return $ret;
    }

    /**
     * 邮件发送
     * @param string $toemail
     * @param string $subject
     * @param string $message
     * @return boolean
     */
    public static function sendMail($toemail = '', $subject = '', $message = '') {
        $mailer = Yii::createComponent ( 'application.extensions.mailer.EMailer' );
        //邮件配置
        $mailer->SetLanguage('zh_cn');
        $mailer->Host = Yii::app()->params['emailHost']; //发送邮件服务器
        $mailer->Port = Yii::app()->params['emailPort']; //邮件端口
        $mailer->Timeout = Yii::app()->params['emailTimeout'];//邮件发送超时时间
        $mailer->ContentType = 'text/html';//设置html格式
        $mailer->SMTPAuth = true;
        $mailer->Username = Yii::app()->params['emailUserName'];
        $mailer->Password = Yii::app()->params['emailPassword'];
        $mailer->IsSMTP ();
        $mailer->From = $mailer->Username; // 发件人邮箱
        $mailer->FromName = Yii::app()->params['emailFormName']; // 发件人姓名
        $mailer->AddReplyTo ( $mailer->Username );
        $mailer->CharSet = 'UTF-8';
        // 添加邮件日志
        $modelMail = new MailLog ();
        $modelMail->accept = $toemail;
        $modelMail->subject = $subject;
        $modelMail->message = $message;
        $modelMail->send_status = 'waiting';
        $modelMail->save ();
        // 发送邮件
        $mailer->AddAddress ( $toemail );
        $mailer->Subject = $subject;
        $mailer->Body = $message;

        if ($mailer->Send () === true) {
            $modelMail->times = $modelMail->times + 1;
            $modelMail->send_status = 'success';
            $modelMail->save ();
            return true;
        } else {
            $error = $mailer->ErrorInfo;
            $modelMail->times = $modelMail->times + 1;
            $modelMail->send_status = 'failed';
            $modelMail->error = $error;
            $modelMail->save ();
            return false;
        }
    }

    /**
     * 判断字符串是utf-8 还是gb2312
     * @param unknown $str
     * @param string $default
     * @return string
     */
    public static function utf8_gb2312($str, $default = 'gb2312')
    {
        $str = preg_replace("/[\x01-\x7F]+/", "", $str);
        if (empty($str)) return $default;

        $preg =  array(
            "gb2312" => "/^([\xA1-\xF7][\xA0-\xFE])+$/", //正则判断是否是gb2312
            "utf-8" => "/^[\x{4E00}-\x{9FA5}]+$/u",      //正则判断是否是汉字(utf8编码的条件了)，这个范围实际上已经包含了繁体中文字了
        );

        if ($default == 'gb2312') {
            $option = 'utf-8';
        } else {
            $option = 'gb2312';
        }

        if (!preg_match($preg[$default], $str)) {
            return $option;
        }
        $str = @iconv($default, $option, $str);

        //不能转成 $option, 说明原来的不是 $default
        if (empty($str)) {
            return $option;
        }
        return $default;
    }
    /**
     * utf-8和gb2312自动转化
     * @param unknown $string
     * @param string $outEncoding
     * @return unknown|string
     */
    public static function safeEncoding($string,$outEncoding = 'UTF-8')
    {
        $encoding = "UTF-8";
        for($i = 0; $i < strlen ( $string ); $i ++) {
            if (ord ( $string {$i} ) < 128)
                continue;

            if ((ord ( $string {$i} ) & 224) == 224) {
            // 第一个字节判断通过
                $char = $string {++ $i};
                if ((ord ( $char ) & 128) == 128) {
            // 第二个字节判断通过
                    $char = $string {++ $i};
                    if ((ord ( $char ) & 128) == 128) {
                        $encoding = "UTF-8";
                        break;
                    }
                }
            }
            if ((ord ( $string {$i} ) & 192) == 192) {
            // 第一个字节判断通过
                $char = $string {++ $i};
                if ((ord ( $char ) & 128) == 128) {
            // 第二个字节判断通过
                    $encoding = "GB2312";
                    break;
                }
            }
        }

        if (strtoupper ( $encoding ) == strtoupper ( $outEncoding ))
            return $string;
        else
            return @iconv ( $encoding, $outEncoding, $string );
    }
    /**
     * 返回二维数组中某个键名的所有值
     * @param input $array
     * @param string $key
     * @return array
     */
    public static function array_key_values($array =array(), $key='')
    {
        $ret = array();
        foreach((array)$array as $k=>$v){
            $ret[$k] = $v[$key];
        }
        return $ret;
    }


    /**
     * 判断 文件/目录 是否可写（取代系统自带的 is_writeable 函数）
     * @param string $file 文件/目录
     * @return boolean
     */
    public static function is_writeable($file) {
        if (is_dir($file)){
            $dir = $file;
            if ($fp = @fopen("$dir/test.txt", 'w')) {
                @fclose($fp);
                @unlink("$dir/test.txt");
                $writeable = 1;
            } else {
                $writeable = 0;
            }
        } else {
            if ($fp = @fopen($file, 'a+')) {
                @fclose($fp);
                $writeable = 1;
            } else {
                $writeable = 0;
            }
        }

        return $writeable;
    }
    /**
     * 格式化单位
     */
    static public function byteFormat( $size, $dec = 2 ) {
        $a = array ( "B" , "KB" , "MB" , "GB" , "TB" , "PB" );
        $pos = 0;
        while ( $size >= 1024 ) {
            $size /= 1024;
            $pos ++;
        }
        return round( $size, $dec ) . " " . $a[$pos];
    }

    /**
     * 下拉框，单选按钮 自动选择
     *
     * @param $string 输入字符
     * @param $param  条件
     * @param $type   类型
     * selected checked
     * @return string
     */
    static public function selected( $string, $param = 1, $type = 'select' ) {

        $true = false;
        if ( is_array( $param ) ) {
            $true = in_array( $string, $param );
        }elseif ( $string == $param ) {
            $true = true;
        }
        $return='';
        if ( $true )
            $return = $type == 'select' ? 'selected="selected"' : 'checked="checked"';

        echo $return;
    }

    /**
     * 下载远程图片
     * @param string $url 图片的绝对url
     * @param string $filepath 文件的完整路径（例如/www/images/test） ，此函数会自动根据图片url和http头信息确定图片的后缀名
     * @param string $filename 要保存的文件名(不含扩展名)
     * @return mixed 下载成功返回一个描述图片信息的数组，下载失败则返回false
     */
    static public function downloadImage($url, $filepath, $filename) {
        //服务器返回的头信息
        $responseHeaders = array();
        //原始图片名
        $originalfilename = '';
        //图片的后缀名
        $ext = '';
        $ch = curl_init($url);
        //设置curl_exec返回的值包含Http头
        curl_setopt($ch, CURLOPT_HEADER, 1);
        //设置curl_exec返回的值包含Http内容
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        //设置抓取跳转（http 301，302）后的页面
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
        //设置最多的HTTP重定向的数量
        curl_setopt($ch, CURLOPT_MAXREDIRS, 3);

        //服务器返回的数据（包括http头信息和内容）
        $html = curl_exec($ch);
        //获取此次抓取的相关信息
        $httpinfo = curl_getinfo($ch);
        curl_close($ch);
        if ($html !== false) {
            //分离response的header和body，由于服务器可能使用了302跳转，所以此处需要将字符串分离为 2+跳转次数 个子串
            $httpArr = explode("\r\n\r\n", $html, 2 + $httpinfo['redirect_count']);
            //倒数第二段是服务器最后一次response的http头
            $header = $httpArr[count($httpArr) - 2];
            //倒数第一段是服务器最后一次response的内容
            $body = $httpArr[count($httpArr) - 1];
            $header.="\r\n";

            //获取最后一次response的header信息
            preg_match_all('/([a-z0-9-_]+):\s*([^\r\n]+)\r\n/i', $header, $matches);
            if (!empty($matches) && count($matches) == 3 && !empty($matches[1]) && !empty($matches[1])) {
                for ($i = 0; $i < count($matches[1]); $i++) {
                    if (array_key_exists($i, $matches[2])) {
                        $responseHeaders[$matches[1][$i]] = $matches[2][$i];
                    }
                }
            }
            //获取图片后缀名
            if (0 < preg_match('{(?:[^\/\\\\]+)\.(jpg|jpeg|gif|png|bmp)$}i', $url, $matches)) {
                $originalfilename = $matches[0];
                $ext = $matches[1];
            } else {
                if (array_key_exists('Content-Type', $responseHeaders)) {
                    if (0 < preg_match('{image/(\w+)}i', $responseHeaders['Content-Type'], $extmatches)) {
                        $ext = $extmatches[1];
                    }
                }
            }
            //保存文件
            if (!empty($ext)) {
                //如果目录不存在，则先要创建目录
                if(!is_dir($filepath)){
                    mkdir($filepath, 0777, true);
                }

                $filepath .= '/'.$filename.".$ext";
                $local_file = fopen($filepath, 'w');
                if (false !== $local_file) {
                    if (false !== fwrite($local_file, $body)) {
                        fclose($local_file);
                        $sizeinfo = getimagesize($filepath);
                        return array('filepath' => realpath($filepath), 'width' => $sizeinfo[0], 'height' => $sizeinfo[1], 'orginalfilename' => $originalfilename, 'filename' => pathinfo($filepath, PATHINFO_BASENAME));
                    }
                }
            }
        }
        return false;
    }


    /**
     * 查找ip是否在某个段位里面
     * @param string $ip 要查询的ip
     * @param $arrIP     禁止的ip
     * @return boolean
     */
    public static function ipAccess($ip='0.0.0.0', $arrIP = array()){
        $access = true;
        $ip && $arr_cur_ip = explode('.', $ip);
        foreach((array)$arrIP as $key=> $value){
            if($value == '*.*.*.*'){
                $access = false; //禁止所有
                break;
            }
            $tmp_arr = explode('.', $value);
            if(($arr_cur_ip[0] == $tmp_arr[0]) && ($arr_cur_ip[1] == $tmp_arr[1])) {
                //前两段相同
                if(($arr_cur_ip[2] == $tmp_arr[2]) || ($tmp_arr[2] == '*')){
                    //第三段为* 或者相同
                    if(($arr_cur_ip[3] == $tmp_arr[3]) || ($tmp_arr[3] == '*')){
                        //第四段为* 或者相同
                        $access = false; //在禁止ip列，则禁止访问
                        break;
                    }
                }
            }
        }
        return $access;
    }

    /**
     * @param string $string 原文或者密文
     * @param string $operation 操作(ENCODE | DECODE), 默认为 DECODE
     * @param string $key 密钥
     * @param int $expiry 密文有效期, 加密时候有效， 单位 秒，0 为永久有效
     * @return string 处理后的 原文或者 经过 base64_encode 处理后的密文
     *
     * @example
     *
     * $a = authcode('abc', 'ENCODE', 'key');
     * $b = authcode($a, 'DECODE', 'key');  // $b(abc)
     *
     * $a = authcode('abc', 'ENCODE', 'key', 3600);
     * $b = authcode('abc', 'DECODE', 'key'); // 在一个小时内，$b(abc)，否则 $b 为空
     */
    public static function authcode($string, $operation = 'DECODE', $key = '', $expiry = 3600) {

        $ckey_length = 4;
        // 随机密钥长度 取值 0-32;
        // 加入随机密钥，可以令密文无任何规律，即便是原文和密钥完全相同，加密结果也会每次不同，增大po,jie难度。
        // 取值越大，密文变动规律越大，密文变化 = 16 的 $ckey_length 次方
        // 当此值为 0 时，则不产生随机密钥


        $key = md5 ( $key ? $key : 'key' ); //这里可以填写默认key值
        $keya = md5 ( substr ( $key, 0, 16 ) );
        $keyb = md5 ( substr ( $key, 16, 16 ) );
        $keyc = $ckey_length ? ($operation == 'DECODE' ? substr ( $string, 0, $ckey_length ) : substr ( md5 ( microtime () ), - $ckey_length )) : '';

        $cryptkey = $keya . md5 ( $keya . $keyc );
        $key_length = strlen ( $cryptkey );

        $string = $operation == 'DECODE' ? base64_decode ( substr ( $string, $ckey_length ) ) : sprintf ( '%010d', $expiry ? $expiry + time () : 0 ) . substr ( md5 ( $string . $keyb ), 0, 16 ) . $string;
        $string_length = strlen ( $string );

        $result = '';
        $box = range ( 0, 255 );

        $rndkey = array ();
        for($i = 0; $i <= 255; $i ++) {
            $rndkey [$i] = ord ( $cryptkey [$i % $key_length] );
        }

        for($j = $i = 0; $i < 256; $i ++) {
            $j = ($j + $box [$i] + $rndkey [$i]) % 256;
            $tmp = $box [$i];
            $box [$i] = $box [$j];
            $box [$j] = $tmp;
        }

        for($a = $j = $i = 0; $i < $string_length; $i ++) {
            $a = ($a + 1) % 256;
            $j = ($j + $box [$a]) % 256;
            $tmp = $box [$a];
            $box [$a] = $box [$j];
            $box [$j] = $tmp;
            $result .= chr ( ord ( $string [$i] ) ^ ($box [($box [$a] + $box [$j]) % 256]) );
        }

        if ($operation == 'DECODE') {
            if ((substr ( $result, 0, 10 ) == 0 || substr ( $result, 0, 10 ) - time () > 0) && substr ( $result, 10, 16 ) == substr ( md5 ( substr ( $result, 26 ) . $keyb ), 0, 16 )) {
                return substr ( $result, 26 );
            } else {
                return '';
            }
        } else {
            return $keyc . str_replace ( '=', '', base64_encode ( $result ) );
        }

    }

    public static function gbkToUtf8($str){
        return iconv("GBK", "UTF-8", $str);
    }

    /**
     * 取得输入目录所包含的所有目录和文件
     * 以关联数组形式返回
     * author: flynetcn
     */
    static public function deepScanDir($dir)
    {
        $fileArr = array();
        $dirArr = array();
        $dir = rtrim($dir, '//');
        if(is_dir($dir)){
            $dirHandle = opendir($dir);
            while(false !== ($fileName = readdir($dirHandle))){
                $subFile = $dir . DIRECTORY_SEPARATOR . $fileName;
                if(is_file($subFile)){
                    $fileArr[] = $subFile;
                } elseif (is_dir($subFile) && str_replace('.', '', $fileName)!=''){
                    $dirArr[] = $subFile;
                    $arr = self::deepScanDir($subFile);
                    $dirArr = array_merge($dirArr, $arr['dir']);
                    $fileArr = array_merge($fileArr, $arr['file']);
                }
            }
            closedir($dirHandle);
        }
        return array('dir'=>$dirArr, 'file'=>$fileArr);
    }


    /**
     * 取得输入目录所包含的所有文件
     * 以数组形式返回
     * author: flynetcn
     */
    static public function get_dir_files($dir)
    {
        if (is_file($dir)) {
            return array($dir);
        }
        $files = array();
        if (is_dir($dir) && ($dir_p = opendir($dir))) {
            $ds = DIRECTORY_SEPARATOR;
            while (($filename = readdir($dir_p)) !== false) {
                if ($filename=='.' || $filename=='..') { continue; }
                $filetype = filetype($dir.$ds.$filename);
                if ($filetype == 'dir') {
                    $files = array_merge($files, self::get_dir_files($dir.$ds.$filename));
                } elseif ($filetype == 'file') {
                    $files[] = $dir.$ds.$filename;
                }
            }
            closedir($dir_p);
        }
        return $files;
    }

    /**
     * 删除文件夹及其文件夹下所有文件
     */
    public static function deldir($dir) {
        //先删除目录下的文件：
        $dh=opendir($dir);
        while ($file=readdir($dh)) {
            if($file!="." && $file!="..") {
                $fullpath=$dir."/".$file;
                if(!is_dir($fullpath)) {
                    unlink($fullpath);
                } else {
                    self::deldir($fullpath);
                }
            }
        }

        closedir($dh);
        //删除当前文件夹：
        if(rmdir($dir)) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * js 弹窗并且跳转
     * @param string $_info
     * @param string $_url
     * @return js
     */
    static public function alertLocation($_info, $_url) {
        echo "<script type='text/javascript'>alert('$_info');location.href='$_url';</script>";
        exit();
    }

    /**
     * js 弹窗返回
     * @param string $_info
     * @return js
     */
    static public function alertBack($_info) {
        echo "<script type='text/javascript'>alert('$_info');history.back();</script>";
        exit();
    }

    /**
     * 页面跳转
     * @param string $url
     * @return js
     */
    static public function headerUrl($url) {
        echo "<script type='text/javascript'>location.href='{$url}';</script>";
        exit();
    }

    /**
     * 弹窗关闭
     * @param string $_info
     * @return js
     */
    static public function alertClose($_info) {
        echo "<script type='text/javascript'>alert('$_info');close();</script>";
        exit();
    }

    /**
     * 弹窗
     * @param string $_info
     * @return js
     */
    static public function alert($_info) {
        echo "<script type='text/javascript'>alert('$_info');</script>";
        exit();
    }

    /**
     * 系统基本参数上传图片专用
     * @param string $_path
     * @return null
     */
    static public function sysUploadImg($_path) {
        echo '<script type="text/javascript">document.getElementById("logo").value="'.$_path.'";</script>';
        echo '<script type="text/javascript">document.getElementById("pic").src="'.$_path.'";</script>';
        echo '<script type="text/javascript">$("#loginpop1").hide();</script>';
        echo '<script type="text/javascript">$("#bgloginpop2").hide();</script>';
    }

    /**
     * html过滤
     * @param array|object $_date
     * @return string
     */
    static public function htmlString($_date) {
        if (is_array($_date)) {
            foreach ($_date as $_key=>$_value) {
                $_string[$_key] = self::htmlString($_value);  //递归
            }
        } elseif (is_object($_date)) {
            foreach ($_date as $_key=>$_value) {
                $_string[$_key] = self::htmlString($_value);  //递归
            }
        } else {
            $_string = htmlspecialchars($_date);
        }
        return $_string;
    }

    /**
     * 数据库输入过滤
     * @param string $_data
     * @return string
     */
    static public function mysqlString($_data) {
        $_data = trim($_data);
        return !GPC ? addcslashes($_data) : $_data;
    }

    /**
     * 清理session
     */
    static public function unSession() {
        if (session_start()) {
            session_destroy();
        }
    }

    /**
     * 验证是否为空
     * @param string $str
     * @param string $name
     * @return bool (true or false)
     */
    static function validateEmpty($str, $name) {
        if (empty($str)) {
            self::alertBack('警告：' .$name . '不能为空！');
        }
    }

    /**
     * 验证是否相同
     * @param string $str1
     * @param string $str2
     * @param string $alert
     * @return JS
     */
    static function validateAll($str1, $str2, $alert) {
        if ($str1 != $str2) self::alertBack('警告：' .$alert);
    }

    /**
     * 验证ID
     * @param Number $id
     * @return JS
     */
    static function validateId($id) {
        if (empty($id) || !is_numeric($id)) self::alertBack('警告：参数错误！');
    }

    /**
     * 格式化字符串
     * @param string $str
     * @return string
     */
    static public function formatStr($str) {
        $arr = array(' ', ' ', '&', '@', '#', '%',  '\'', '"', '\\', '/', '.', ',', '$', '^', '*', '(', ')', '[', ']', '{', '}', '|', '~', '`', '?', '!', ';', ':', '-', '_', '+', '=');
        foreach ($arr as $v) {
            $str = str_replace($v, '', $str);
        }
        return $str;
    }

    /**
     * 格式化时间
     * @param int $time 时间戳
     * @return string
     */
    static public function formatDate($time='default') {
        $date = $time == 'default' ? date('Y-m-d H:i:s', time()) : date('Y-m-d H:i:s', $time);
        return $date;
    }

    /**
     * 获得真实IP地址
     * @return string
     */
    static public function realIp() {
        static $realip = NULL;
        if ($realip !== NULL) return $realip;
        if (isset($_SERVER)) {
            if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
                $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
                foreach ($arr AS $ip) {
                    $ip = trim($ip);
                    if ($ip != 'unknown') {
                        $realip = $ip;
                        break;
                    }
                }
            } elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
                $realip = $_SERVER['HTTP_CLIENT_IP'];
            } else {
                if (isset($_SERVER['REMOTE_ADDR'])) {
                    $realip = $_SERVER['REMOTE_ADDR'];
                } else {
                    $realip = '0.0.0.0';
                }
            }
        } else {
            if (getenv('HTTP_X_FORWARDED_FOR')) {
                $realip = getenv('HTTP_X_FORWARDED_FOR');
            } elseif (getenv('HTTP_CLIENT_IP')) {
                $realip = getenv('HTTP_CLIENT_IP');
            } else {
                $realip = getenv('REMOTE_ADDR');
            }
        }
        preg_match('/[\d\.]{7,15}/', $realip, $onlineip);
        $realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';
        return $realip;
    }

    /**
     * 加载 Smarty 模板
     * @param string $html
     * @return null;
     */
    static public function display() {
        global $tpl;$html = null;
        $htmlArr = explode('/', $_SERVER[SCRIPT_NAME]);
        $html = str_ireplace('.php', '.html', $htmlArr[count($htmlArr)-1]);
        $dir = dirname($_SERVER[SCRIPT_NAME]);
        $firstStr = substr($dir, 0, 1);
        $endStr = substr($dir, strlen($dir)-1, 1);
        if ($firstStr == '/' || $firstStr == '\\') $dir = substr($dir, 1);
        if ($endStr != '/' || $endStr != '\\') $dir = $dir . '/';
        $tpl->display($dir.$html);
    }

    /**
     * 创建目录
     * @param string $dir
     */
    static public function createDir($dir) {
        if (!is_dir($dir)) {
            mkdir($dir, 0777);
        }
    }

    /**
     * 创建文件（默认为空）
     * @param unknown_type $filename
     */
    static public function createFile($filename) {
        if (!is_file($filename)) touch($filename);
    }

    /**
     * 正确获取变量
     * @param string $param
     * @param string $type
     * @return string
     */
    static public function getData($param, $type='post') {
        $type = strtolower($type);
        if ($type=='post') {
            return self::mysqlString(trim($_POST[$param]));
        } elseif ($type=='get') {
            return self::mysqlString(trim($_GET[$param]));
        }
    }

    /**
     * 删除文件
     * @param string $filename
     */
    static public function delFile($filename) {
        if (file_exists($filename)) unlink($filename);
    }

    /**
     * 删除目录
     * @param string $path
     */
    static public function delDir1($path) {
        if (is_dir($path)) rmdir($path);
    }

    /**
     * 删除目录及地下的全部文件
     * @param string $dir
     * @return bool
     */
    static public function delDirOfAll($dir) {
        //先删除目录下的文件：
        if (is_dir($dir)) {
            $dh=opendir($dir);
            while (!!$file=readdir($dh)) {
                if($file!="." && $file!="..") {
                    $fullpath=$dir."/".$file;
                    if(!is_dir($fullpath)) {
                        unlink($fullpath);
                    } else {
                        self::delDirOfAll($fullpath);
                    }
                }
            }
            closedir($dh);
            //删除当前文件夹：
            if(rmdir($dir)) {
                return true;
            } else {
                return false;
            }
        }
    }

    /**
     * 验证登陆
     */
    static public function validateLogin() {
        if (empty($_SESSION['admin']['user'])) header('Location:/admin/');
    }

    /**
     * 给已经存在的图片添加水印
     * @param string $file_path
     * @return bool
     */
    static public function addMark($file_path) {
        if (file_exists($file_path) && file_exists(MARK)) {
            //求出上传图片的名称后缀
            $ext_name = strtolower(substr($file_path, strrpos($file_path, '.'), strlen($file_path)));
            //$new_name='jzy_' . time() . rand(1000,9999) . $ext_name ;
            $store_path = ROOT_PATH . UPDIR;
            //求上传图片高宽
            $imginfo = getimagesize($file_path);
            $width = $imginfo[0];
            $height = $imginfo[1];
            //添加图片水印
            switch($ext_name) {
                case '.gif':
                    $dst_im = imagecreatefromgif($file_path);
                    break;
                case '.jpg':
                    $dst_im = imagecreatefromjpeg($file_path);
                    break;
                case '.png':
                    $dst_im = imagecreatefrompng($file_path);
                    break;
            }
            $src_im = imagecreatefrompng(MARK);
            //求水印图片高宽
            $src_imginfo = getimagesize(MARK);
            $src_width = $src_imginfo[0];
            $src_height = $src_imginfo[1];
            //求出水印图片的实际生成位置
            $src_x = $width - $src_width - 10;
            $src_y = $height - $src_height - 10;
            //新建一个真彩色图像
            $nimage = imagecreatetruecolor($width, $height);
            //拷贝上传图片到真彩图像
            imagecopy($nimage, $dst_im, 0, 0, 0, 0, $width, $height);
            //按坐标位置拷贝水印图片到真彩图像上
            imagecopy($nimage, $src_im, $src_x, $src_y, 0, 0, $src_width, $src_height);
            //分情况输出生成后的水印图片
            switch($ext_name) {
                case '.gif':
                    imagegif($nimage, $file_path);
                    break;
                case '.jpg':
                    imagejpeg($nimage, $file_path);
                    break;
                case '.png':
                    imagepng($nimage, $file_path);
                    break;
            }
            //释放资源
            imagedestroy($dst_im);
            imagedestroy($src_im);
            unset($imginfo);
            unset($src_imginfo);
            //移动生成后的图片
            @move_uploaded_file($file_path, ROOT_PATH.UPDIR . $file_path);
        }
    }

    /**
     *  中文截取2，单字节截取模式
     * @access public
     * @param string $str  需要截取的字符串
     * @param int $slen  截取的长度
     * @param int $startdd  开始标记处
     * @return string
     */
    static public function cn_substr($str, $slen, $startdd=0){
        $cfg_soft_lang = PAGECHARSET;
        if($cfg_soft_lang=='utf-8') {
            return self::cn_substr_utf8($str, $slen, $startdd);
        }
        $restr = '';
        $c = '';
        $str_len = strlen($str);
        if($str_len < $startdd+1) {
            return '';
        }
        if($str_len < $startdd + $slen || $slen==0) {
            $slen = $str_len - $startdd;
        }
        $enddd = $startdd + $slen - 1;
        for($i=0;$i<$str_len;$i++) {
            if($startdd==0) {
                $restr .= $c;
            } elseif($i > $startdd) {
                $restr .= $c;
            }
            if(ord($str[$i])>0x80) {
                if($str_len>$i+1) {
                    $c = $str[$i].$str[$i+1];
                }
                $i++;
            } else {
                $c = $str[$i];
            }
            if($i >= $enddd) {
                if(strlen($restr)+strlen($c)>$slen) {
                    break;
                } else {
                    $restr .= $c;
                    break;
                }
            }
        }
        return $restr;
    }

    /**
     *  utf-8中文截取，单字节截取模式
     *
     * @access public
     * @param string $str 需要截取的字符串
     * @param int $slen 截取的长度
     * @param int $startdd 开始标记处
     * @return string
     */
    static public function cn_substr_utf8($str, $length, $start=0) {
        if(strlen($str) < $start+1) {
            return '';
        }
        preg_match_all("/./su", $str, $ar);
        $str = '';
        $tstr = '';
        //为了兼容mysql4.1以下版本,与数据库varchar一致,这里使用按字节截取
        for($i=0; isset($ar[0][$i]); $i++) {
            if(strlen($tstr) < $start) {
                $tstr .= $ar[0][$i];
            } else {
                if(strlen($str) < $length + strlen($ar[0][$i]) ) {
                    $str .= $ar[0][$i];
                } else {
                    break;
                }
            }
        }
        return $str;
    }

    /**
     * 删除图片，根据图片ID
     * @param int $image_id
     */
    static function delPicByImageId($image_id) {
        $db_name = PREFIX . 'images i';
        $m = new Model();
        $data = $m->getOne($db_name, "i.id={$image_id}", "i.path as p, i.big_img as b, i.small_img as s");
        foreach ($data as $v) {
            @self::delFile(ROOT_PATH . $v['p']);
            @self::delFile(ROOT_PATH . $v['b']);
            @self::delFile(ROOT_PATH . $v['s']);
        }
        $m->del(PREFIX . 'images', "id={$image_id}");
        unset($m);
    }

    /**
     * 图片等比例缩放
     * @param resource $im    新建图片资源(imagecreatefromjpeg/imagecreatefrompng/imagecreatefromgif)
     * @param int $maxwidth   生成图像宽
     * @param int $maxheight  生成图像高
     * @param string $name    生成图像名称
     * @param string $filetype文件类型(.jpg/.gif/.png)
     */
    static public function resizeImage($im, $maxwidth, $maxheight, $name, $filetype) {
        $pic_width = imagesx($im);
        $pic_height = imagesy($im);
        if(($maxwidth && $pic_width > $maxwidth) || ($maxheight && $pic_height > $maxheight)) {
            if($maxwidth && $pic_width>$maxwidth) {
                $widthratio = $maxwidth/$pic_width;
                $resizewidth_tag = true;
            }
            if($maxheight && $pic_height>$maxheight) {
                $heightratio = $maxheight/$pic_height;
                $resizeheight_tag = true;
            }
            if($resizewidth_tag && $resizeheight_tag) {
                if($widthratio<$heightratio)
                    $ratio = $widthratio;
                else
                    $ratio = $heightratio;
            }
            if($resizewidth_tag && !$resizeheight_tag)
                $ratio = $widthratio;
            if($resizeheight_tag && !$resizewidth_tag)
                $ratio = $heightratio;
            $newwidth = $pic_width * $ratio;
            $newheight = $pic_height * $ratio;
            if(function_exists("imagecopyresampled")) {
                $newim = imagecreatetruecolor($newwidth,$newheight);
                imagecopyresampled($newim,$im,0,0,0,0,$newwidth,$newheight,$pic_width,$pic_height);
            } else {
                $newim = imagecreate($newwidth,$newheight);
                imagecopyresized($newim,$im,0,0,0,0,$newwidth,$newheight,$pic_width,$pic_height);
            }
            $name = $name.$filetype;
            imagejpeg($newim,$name);
            imagedestroy($newim);
        } else {
            $name = $name.$filetype;
            imagejpeg($im,$name);
        }
    }

    /**
     * 下载文件
     * @param string $file_path 绝对路径
     */
    static public function downFile($file_path) {
        //判断文件是否存在
        $file_path = iconv('utf-8', 'gb2312', $file_path); //对可能出现的中文名称进行转码
        if (!file_exists($file_path)) {
            exit('文件不存在！');
        }
        $file_name = basename($file_path); //获取文件名称
        $file_size = filesize($file_path); //获取文件大小
        $fp = fopen($file_path, 'r'); //以只读的方式打开文件
        header("Content-type: application/octet-stream");
        header("Accept-Ranges: bytes");
        header("Accept-Length: {$file_size}");
        header("Content-Disposition: attachment;filename={$file_name}");
        $buffer = 1024;
        $file_count = 0;
        //判断文件是否结束
        while (!feof($fp) && ($file_size-$file_count>0)) {
            $file_data = fread($fp, $buffer);
            $file_count += $buffer;
            echo $file_data;
        }
        fclose($fp); //关闭文件
    }

}